Rechargeable 2200mAh battery for Wii Fit board. Simply recharge by connecting usb cable to battery. Never run out of battery power when you are about to score the winning point. Save money and protect the environment by using the rechargeable battery. High capacity battery that lasts 2~4 times longer than the standard AA batteries. No additional charger is needed to recharge the battery. Just plug it into any USB port. Battery?s built-in cover replaces the original Wii Fit cover. Wii remote controller not included.